NET (LOSS) INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Amounts attributable to Coty Inc.:
Net income attributable to Coty Inc.	$ (405.7)	$ 3.8	$ (299.1)	$ 186.3
Convertible Series B Preferred Stock dividends	(3.3)	(3.3)	(9.9)	(9.9)
Net (loss) income attributable to common stockholders	$ (409.0)	$ 0.5	$ (309.0)	$ 176.4
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	872.1	883.1	870.4	876.7
Effect of dilutive stock options and Series A Preferred Stock (in shares)	0.0	0.2	0.0	0.1
Effect of restricted stock and RSUs (in shares)	0.0	8.7	0.0	9.3
Effect of Convertible Series B Preferred Stock (in shares)	0.0	0.0	0.0	0.0
Effect of Forward Repurchase Contracts (in shares)	0.0	0.0	0.0	0.0
Weighted-average common shares outstanding—Diluted (in shares)	872.1	892.0	870.4	886.1
Earnings per common share:
Earnings per common share - basic (in dollars per share)	$ (0.47)	$ 0	$ (0.36)	$ 0.20
Earnings per common share - diluted (in dollars per share)	$ (0.47)	$ 0	$ (0.36)	$ 0.20
Convertible Series B Preferred Stock dividends	$ 3.3	$ 3.3	$ 9.9	$ 9.9
Antidilutive​ fair market value losses (gains)	$ 60.1	$ 7.1	$ 188.9	$ 6.9
Stock Options and Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	3.4	1.7	3.5	2.5
Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)			0.0
RSUs
Earnings per common share:
Anti-dilutive shares (in shares)	14.9	0.0	9.5	1.3
Restricted stock outstanding (in shares)	0.0	0.0	0.0	0.0
Series B Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	0.0	0.0	0.0	0.0
Forward Contracts
Earnings per common share:
Anti-dilutive shares (in shares)	0.0	0.0	0.0	0.0